So, here is my success story :) 

I tried a few days to get an EDIMAX 7811UN to work on my BBB with Angstrom. 
The built-in rtl8192cu did not work, compiling realtek driver from source 
was not helpful as well. An upgrade to image-2013.09.04 changed nothing. 

The signal level was very weak and connection was lost, as soon BBB was 3 
meters far from my AP.

Finally I got it out with disabling of HDMI. 
My thoughts were: 
why is there so much over HDMI in dmesg?
HDMI port is near USB ... 

So, what... I've mount the FAT partiotion and change the uEnv.txt to:

optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

Now, EDIMAX works without usb extension cable, seems to be stable and I can 
put my board in an other room :)

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